The EEPROM is pre-programmed with code to boot from the microSD card (user supplied) which will normally contain some form of operating system such as my free PropOS.
It also works with a cheap USB-TTL CP2102 using the linkable transistor reset circuit as an alternative to the PropPlug. +5V power can be provided by the USB-TTL board.

The P8XBlade2 can be used as the basis of any Propeller Development System.

Together with a microSD card formatted with FAT32 and loaded with my free PropOS (Propeller Operating System with similar commands to the old PC DOS and CPM), the Prop will boot into PropOS, or run a user program, without the need for an expensive PropPlug.

Here is the output from PropOS...
Note that there are additional files that I use to run ZiCog/CPM on RamBlade. (I use the same microSD card)

Here are the PropOS files...
_os_v080_20151215_P8XBlade2.zip has the files required in the root directory on the microSD card FAT16/32 directory.
_os_v080_20151215_P8xBlade2(source).zip has all the files required to build PropOS including the compiler Homespun.

I have a limited number of these CpuBlade7's 2"x2" (~50x50mm) boards available.
This was a prototype and there will not be any more of these.

Essentially they are a P8XBlade2
* except the microSD is on pins P8..P11
* the processor section is extended to add a microUSB connector
* the pinouts P25...GND are now each side rather than across the board
* there is a prototype area that includes pinouts for Raspberry Pi and Arduino footprints
* the pcb is Blue HASL

Note to use the microSD it is required that part of the Raspberry Pi interface pins be cut out. There are a couple of NPTH holes to help with this.

The P8XBlade2P (P=Prototyping Board) due January will be an exact P8XBlade2 replica (no microUSB) plus the prototype area with Raspberry Pi and Arduino footprints.

Any idea what the postage would be to uk?
How do we order- cant see an order form on website so- pm and paypal?
I think $16 would just about slip under the UK customs radar - I don't mind paying the UK tax, its paying as much again to have the postie collect it!!!

tritonium,
Same postage to all countries (I will cover any variations) although some countries have higher risk of theft
Pay via PayPal and send me an email please (or just include a note with PayPal).

For anyone who wants to use a different xtal, there is a pair of via holes that will take crystal leads from either a watch can or bend the leads of an HC49US and let it sit up from the board. You will need to ask me to not fit the smt crystal !!! I have a 14MHz watch can to try

Very nice!! What linear regulator are you using? Have you measured your current with all cogs sleeping, unused pins pulled high? I wonder if this would be good for battery projects. I guess it ships with a boot loader in the EEPROM to allow it to boot with your OS. Can I guy download a normal SPIN application to the EEPROM with the propeller tool?

So, since the Pimoroni Prop HAT has reverted back to its normal price of £15 (£25 for 2 !), we now have a new reigning champion for cheapest Propeller board. Yeah, Cluso !

But, uh... fellow Americans, this embarrassing. Except for Parallax, we've got slim pickins. Even the RoboProp (not a contender for cheapest, but it gets extra points for its Pi header) is from Canada.